SQL Server returns "Arithmetic overflow error converting expression to data type int."

For values larger than the INT max (2,147,483,647), you'll want to use COUNT_BIG(*).

SELECT COUNT_BIG(*) AS [Records], SUM(t.Amount) AS [Total]
FROM   dbo.t1 AS t
WHERE  t.Id > 0
       AND t.Id < 101;

If it's happening in the SUM, you need to convert Amount to a BIGINT.

SELECT COUNT(*) AS [Records], SUM(CONVERT(BIGINT, t.Amount)) AS [Total]
FROM   dbo.t1 AS t
WHERE  t.Id > 0
       AND t.Id < 101;

This issue is caused by SUM() function

you have to CAST t.Amount as BIGINT

SELECT COUNT(*) AS [Records], SUM(CAST(t.Amount AS BIGINT)) AS [Total]
FROM   dbo.t1 AS t
WHERE  t.Id > 0
       AND t.Id < 101;

Reference

https://stackoverflow.com/questions/8289310/how-to-prevent-arithmetic-overflow-error-when-using-sum-on-int-column

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